(19) |
 |
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(11) |
EP 1 759 763 A3 |
(12) |
EUROPEAN PATENT APPLICATION |
(88) |
Date of publication A3: |
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05.12.2007 Bulletin 2007/49 |
(43) |
Date of publication A2: |
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07.03.2007 Bulletin 2007/10 |
(22) |
Date of filing: 25.08.2006 |
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(51) |
International Patent Classification (IPC):
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(84) |
Designated Contracting States: |
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AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE
SI SK TR |
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Designated Extension States: |
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AL BA HR MK YU |
(30) |
Priority: |
05.09.2005 JP 2005256581
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(71) |
Applicant: Mazda Motor Corporation |
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Aki-gun,
Hiroshima 730-8670 (JP) |
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(72) |
Inventors: |
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- Harada, Koichiro
Aki-gun
Hiroshima 730-8670 (JP)
- Fujita, Hiroki
Aki-gun
Hiroshima 730-8670 (JP)
- Okamoto, Kenji
Aki-gun
Hiroshima 730-8670 (JP)
- Tsushio, Yoshinori
Aki-gun
Hiroshima 730-8670 (JP)
- Takami, Akihide
Aki-gun
Hiroshima 730-8670 (JP)
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(74) |
Representative: Zinnecker, Armin et al |
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Lorenz-Seidler-Gossel,
Widenmayerstrasse 23 80538 München 80538 München (DE) |
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(54) |
Exhaust gas purification catalyst and catalyst-equipped diesel particulate filter |
(57) To improve the performance of an exhaust gas purification catalyst and enhance the
particulate matter burning rate of a catalyst-equipped diesel particulate filter,
the catalyst contains a mixed oxide of Zr, at least one kind of rare earth metal other
than Ce and precious metal. The rare earth metal is selected from the group of Y,
Yb, Nd and Sc. The mixed oxide is obtained by mixing an acidic solution containing
Zr ions, ions of at least one kind of rare earth metal other than Ce and precious
metal ions with a basic solution to obtain a mixed oxide precursor through coprecipitation
and calcining the precursor.